Middle portion section of a motor vehicle



FIG. 1 is a left, front perspective view of a middle portion section of a motor vehicle, showing my new design;

FIG. 2 is a right, rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a left-side view thereof; and,

FIG. 7 is a top view thereof.

The broken lines shown in the drawings depict portions that form no part of the claimed design. 

CLAIM The ornamental design for a middle portion section of a motor vehicle, as shown and described. 